O200A Cruise RPM?

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O200A Cruise RPM?

Post by 8452 » Tue Jul 09, 2019 5:58 pm

I typically cruised my old, tired engine at 2450. Can I bump that up some with my fresh, strong engine?

What do you cruise at?
Larry Bible

Returned to the club after three years away due to life’s changes
1948 Cessna 140, O200A, Ragwing, Custom IFR Panel
1966 Mooney M20F/J

8452
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Re: O200A Cruise RPM?

Post by 8452 » Tue Jul 09, 2019 9:01 pm

Come on folks! You can share your favorite cruise RPM.
Larry Bible

Returned to the club after three years away due to life’s changes
1948 Cessna 140, O200A, Ragwing, Custom IFR Panel
1966 Mooney M20F/J

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Re: O200A Cruise RPM?

Post by 8424 » Tue Jul 09, 2019 9:14 pm

Hi Larry.

My O-200 powered 140A isn't flying yet (motor is still on the 150, but I do have the STC!) , but I had a 150F that I cruised at 2400-2450 and was planning on the same with the 140.

Hope some of the O-200 flyers will join in.

Steve H

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Re: O200A Cruise RPM?

Post by 2356 » Tue Jul 09, 2019 9:44 pm

I use 2550. I believe this is 75% power.

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Re: O200A Cruise RPM?

Post by 6298 » Tue Jul 09, 2019 10:55 pm

I cruise at about 2550 RPM.
Randy Thompson A&P IA Pilot
Hold STC SA547EA for installation of O-200 engine in Cessna 120/140 and 140A"s
Overhaul small Continentals

8452
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Re: O200A Cruise RPM?

Post by 8452 » Wed Jul 10, 2019 5:24 am

Thanks a bunch guys!
Larry Bible

Returned to the club after three years away due to life’s changes
1948 Cessna 140, O200A, Ragwing, Custom IFR Panel
1966 Mooney M20F/J

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Re: O200A Cruise RPM?

Post by 6183 » Wed Jul 10, 2019 9:35 am

Now if you're flying power line patrol, and want to increase your time on station, I use 2200-2250. When I want to go someplace 2450, but that's me. Others report higher power settings. Big thing here is the faster that crankshaft turns the more fuel you're going to burn. All boils down to what you are trying to do. Just my 2 cents.

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Re: O200A Cruise RPM?

Post by 7896 » Wed Jul 10, 2019 11:07 am

2450 rpm for me too. Results in ~105-110 mph on the airspeed indicator.
Michael Haas
'46 120 - N76219
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Re: O200A Cruise RPM?

Post by 7392 » Wed Jul 10, 2019 4:33 pm

Just out of curiosity, what RPM do you guys set with an 85-12F with a 69.5X49 prop?
I vary between 2300 to 2500......depends on if I want to get there in an hour or an hour
and 5 minutes.

Larry Surratt
1946 140
N89011
serial#8015
26R/JACKSON COUNTY TEXAS

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Re: O200A Cruise RPM?

Post by VIP529 » Fri Jul 12, 2019 9:32 pm

I'm a little late to the party,

I cruise at 2500 consistently. That being said, some engines are smoother at one RPM or another. My engine likes the 2500-2600 RPM range. Below 2450 it is noticeably rougher. No scientific data, but I've always felt that a smooth running engine is probably a happy engine, so I leave the RPM's where they are the smoothest.

I had a Mooney (yeah......I know..........somebody's gonna kick in with ..........."I'm sorry") for almost 20 years. It also had very defined "smooth" Rpms' even with the constant speed prop and much more availability to move around RPM and manifold pressure, I typically cruised at the smoothest RPM.

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